The GSG Firefly in OD Green is a .22 LR semi-automatic pistol with a DA/SA trigger and a zinc alloy frame. It holds 10+1 rounds and weighs 24.6 oz, making it a practical option for range training and plinking. 
 

Key Specifications 

• Brand: GSG 
• Model Name: Firefly 
• Caliber: .22 LR 
• Action: Double Action/Single Action (DA/SA) 
• Capacity: 10+1 rounds 
• Barrel Length: 4 inches 
• Overall Length: 7.2 inches 
• Weight: 1.5 lbs (24.6 oz) 
• Finish Color: OD Green (Olive Drab) 
• Grip Material: Black Polymer 
• Sights Configuration: 3-Dot Adjustable Rear Sight 
• Safety Feature: Ambidextrous Thumb Safety 
   

Detailed Features 

The zinc alloy frame keeps the overall package to 24.6 oz without sacrificing durability for regular range use. The adjustable rear sight lets shooters tune the point of impact rather than having to compensate manually. The ambidextrous thumb safety works for both right- and left-handed operation. The polymer grip is functional and comfortable for extended sessions. 
 
At 7.2 inches overall and with the DA/SA trigger, the Firefly gives shooters the option of a longer first pull or a cocked-hammer single-action shot. The 4-inch barrel provides a useful sight radius for a .22 LR pistol at typical range distances. 
 
The OD Green finish is more tactically oriented than the other Firefly color options and fits in with a range bag aesthetic that some shooters prefer.

Owners of the GSG Firefly OD Green generally appreciate its affordability and .22 LR credentials while acknowledging some reliability and accuracy limitations.

The price and .22 LR chambering are consistently cited as the main reasons buyers chose it, particularly for beginners or those who want a low-cost option for practice. The OD Green finish draws favorable comments for its distinct look. Most owners describe the pistol as comfortable to hold and balanced well enough for casual shooting.

On the downside, reliability with certain ammunition types is a recurring issue -- some owners report misfires or jams with bulk or low-quality .22 LR, which is common for the caliber but still a frustration. The DA/SA trigger is functional but some find the pull weight less refined than on higher-end pistols. Build quality is adequate for an entry-level firearm, though owners who have handled more expensive options note the difference in fit and finish.

Accuracy at longer ranges gets mixed marks; the Firefly handles short-range plinking and casual target work well, but precision shooters may find it falls short for tighter distance work.

For training, plinking, and introducing new shooters to semi-automatic pistol operation, the Firefly OD Green covers the job at an accessible price.